X0306 4 2021-02-09 0 0001408198 MSCI Inc. MSCI 0001416752 Pettit CD Baer MSCI INC. 7 WORLD TRADE CENTER, 250 GREENWICH ST NEW YORK NY 10007 0 1 0 0 President & COO Common Stock 2021-02-09 4 F 0 578 417.97 D 265567 D Common Stock 2021-02-09 4 F 0 547 417.97 D 265020 D Represents shares reacquired by MSCI Inc. to satisfy tax withholding obligations in connection with the vesting and conversion to shares of the third tranche of 1,228 restricted stock units granted on February 6, 2018. Represents shares reacquired by MSCI Inc. to satisfy tax withholding obligations in connection with the vesting and conversion to shares of the second tranche of 1,163 restricted stock units granted on February 7, 2019. /s/ Cecilia Aza, attorney-in-fact 2021-02-11